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This removes quite a bit of code. All reasonable systems have /dev/urandom these days. Linux, Solaris and the BSDs do. In case we find a system without /dev/urandom, we will have to go hunting in other libraries. The main reason for this is speed: On Ubuntu 14.04 doing direct reads from /dev/urandom is 2-3 times faster than our md4 based code. On virtualized FreeBSD 10 the difference is even larger. My first approach was to use fopen/fread. It was even faster, but less than twice as fast. So I thought we could save the additional complexity when having to deal with throwing away buffers when forking and the additional memory footprint per process. With this simple generate_random_buffer it will be easier to adapt new syscalls to get randomness. Signed-off-by: Volker Lendecke <vl@samba.org> Reviewed-by: Jeremy Allison <jra@samba.org> Autobuild-User(master): Jeremy Allison <jra@samba.org> Autobuild-Date(master): Tue Oct 13 04:25:39 CEST 2015 on sn-devel-104